IJ-I Iodide - Ionode
User maintenance and troubleshooting Symptom Possible cause
Remedy
Drift
Remove and clean sleeve
Junction blocked
Membrane unclean Remove sleeve. Gently or contaminated polish membrane with P1200 “Wet & Dry” Noisy
Poor connection to meter
Check connection
Junction not immersed fully
Lower electrode into solution below junction
Insufficient electrolyte or bubble
Refill electrolyte
Inaccurate Contaminated readings standard(s) or poor reproducibility Improperly made standards
IJ electrodes have a warranty of 12 months from date of purchase. Any electrode found to be faulty due to manufacture within this time will be replaced. Ionode reserves the right to limit or modify product warranty if it is deemed that the electrode has been used in unsuitable applications. Electrodes with broken stems, connectors or cables are not covered by warranty. Electrode life may be reduced in chemically aggressive or abrasive samples and at high temperatures.
Temperature differences between calibration and sample measurement
Ensure calibration and sample measurements are done at the same temperature
Add ISA
Sensitivity to light Perform calibration and measurements in dark beakers or away from bright light
Short-Form
Intermediate Junction Series
IJ-I
Recalibrate using freshly made standards Use 1M potassium nitrate in sleeve
Operators Manual
Visit www.ionode.com for more information.
Make up fresh calibration standards and recalibrate
Contamination from electrolyte
No ISA used
Warranty
All specifications and values are subject to change without notice. © 2012 Images are illustrative only.
Parameter
Operating Range
Concentration range
0.01 to 130,000 mg/L
Temperature range
0 – 60ºC
pH range
2-12 pH
Reference Type
Double Junction Ag/AgCl/refillable
Sensor materials
Polycrystalline solid state membrane
Body and sleeve
Polypropylene/PEEK
Overall length
150mm
Barrel diameter
12mm
Cable length
1m standard, longer to order. Maximum 20m
Connector
BNC standard, others on request
IODIDE ION SELECTIVE ELECTRODE
GOOD CHEMISTRY
Application
EMISTRY
Introduction This guide contains the basic information for proper use of your Iodide Ion-selective electrode.
The Ionode IJ-I Ion selective electrode responds reversibly to Iodide, Cyanide and Silver ions. The limit of detection is 5 x 10-8M Iodide. Use known addition for [I-] > 0.1M. Try to avoid exposure of the electrode to direct sunlight, and avoid use in strong reducing agents.
Interfering Ions
EMISTRY
Preparation IJ series electrodes are shipped without sleeve electrolyte, and must be filled prior to use. To fill, hold the electrode by the sleeve and gently ease off the rubber wetting cap. Prepare as follows: 1.
1.
Invert the electrode. Hold the electrode just below the sleeve and with careful rotation and pulling along the axis of the electrode, remove the sleeve. DO NOT BEND.
2.
2.
Fill the annular space with electrolyte to approximately half to three quarter full. 1M potassium nitrate is normally recommended.
3.
3.
Slide the sleeve back onto the electrode ensuring the black O-ring is well seated within the electrode body. Do not exert sideways force. Any excess electrolyte will be expelled from the end of the electrode through the ground junction. Ensure there are no air bubbles in the sleeve.Wash off any excess electrolyte before use.
Max. ratio of Interfering Ions/ Bromide Ion as follows Chloride: 1 x 106, Bromide: 1 x 103, Cyanide: 2 x 10-2 Sulphide: Must be absent.
Cleaning If the membrane is poisoned by interferences, the surface may be renewed by careful polishing with fine wet-and-dry (P1200 grade). The electrode surface should appear yellow or yellow-grey with waxy lustre. Always inspect the membrane before use, and clean if necessary. Organic contaminants can be removed with ethanol. DO NOT use the electrode in chlorinated hydrocarbons.Routinely remove the sleeve and replace the potassium nitrate electrolyte.
Calibration Procedure With your meter set on mV (or on concentration on Ion Meters), calibrate by immersing the electrode in a stirred calibration standard (with added ISA), starting with the lowest concentration first. Wait for stability, note the potential in mV, and then carefully rinse and blot dry the electrode before repeating with the next highest standard, until all the calibration standards have been measured. When using meters that do not have direct concentration readouts, record the data and graph the potential against log of the Bromide Ion concentration. The graph should have a slope of approximately -55mV/decade of concentration at 25C.
Typical Calibration Curve
Electrolyte Replacement The electrode has an inbuilt double junction Ag/AgCl with a replaceable sleeve electrolyte. 1M potassium nitrate is suitable for most applications. Please consult Ionode Customer Service if you wish to use a different sleeve electrolyte.
Calibration Standards Standard solutions of Iodide Ion should preferably bracket the expected measurement range. For example, to determine Iodide ions in the 1-40mg/L range, it is usually adequate to use standard Iodide solutions in the following values:1.0, 10.0 and 100.0 mg/L
The need for ISA (Ionic Strength Adjuster) It is important to use ISA, so that the Ionic Strength of standards and samples is independent of the concentration of the Iodide Ion. A suitable ISA is potassium nitrate, which is added to both standards and samples. As a guide, add 5ml 1M potassium nitrate to every 25ml of calibration standard or sample.
Sample Measurement Follow the same basic procedures as calibration, substituting the calibration standard for your sample. It is important to use the same stirring conditions, temperature, etc for best results. Use the same ratio of sample/ISA as used in the calibration step. Read off the concentration from the graph or directly from Ion meters. For more information, visit ionode.com
Remedy
Drift
Remove and clean sleeve
Junction blocked
Membrane unclean Remove sleeve. Gently or contaminated polish membrane with P1200 “Wet & Dry” Noisy
Poor connection to meter
Check connection
Junction not immersed fully
Lower electrode into solution below junction
Insufficient electrolyte or bubble
Refill electrolyte
Inaccurate Contaminated readings standard(s) or poor reproducibility Improperly made standards
IJ electrodes have a warranty of 12 months from date of purchase. Any electrode found to be faulty due to manufacture within this time will be replaced. Ionode reserves the right to limit or modify product warranty if it is deemed that the electrode has been used in unsuitable applications. Electrodes with broken stems, connectors or cables are not covered by warranty. Electrode life may be reduced in chemically aggressive or abrasive samples and at high temperatures.
Temperature differences between calibration and sample measurement
Ensure calibration and sample measurements are done at the same temperature
Add ISA
Sensitivity to light Perform calibration and measurements in dark beakers or away from bright light
Short-Form
Intermediate Junction Series
IJ-I
Recalibrate using freshly made standards Use 1M potassium nitrate in sleeve
Operators Manual
Visit www.ionode.com for more information.
Make up fresh calibration standards and recalibrate
Contamination from electrolyte
No ISA used
Warranty
All specifications and values are subject to change without notice. © 2012 Images are illustrative only.
Parameter
Operating Range
Concentration range
0.01 to 130,000 mg/L
Temperature range
0 – 60ºC
pH range
2-12 pH
Reference Type
Double Junction Ag/AgCl/refillable
Sensor materials
Polycrystalline solid state membrane
Body and sleeve
Polypropylene/PEEK
Overall length
150mm
Barrel diameter
12mm
Cable length
1m standard, longer to order. Maximum 20m
Connector
BNC standard, others on request
IODIDE ION SELECTIVE ELECTRODE
GOOD CHEMISTRY
Application
EMISTRY
Introduction This guide contains the basic information for proper use of your Iodide Ion-selective electrode.
The Ionode IJ-I Ion selective electrode responds reversibly to Iodide, Cyanide and Silver ions. The limit of detection is 5 x 10-8M Iodide. Use known addition for [I-] > 0.1M. Try to avoid exposure of the electrode to direct sunlight, and avoid use in strong reducing agents.
Interfering Ions
EMISTRY
Preparation IJ series electrodes are shipped without sleeve electrolyte, and must be filled prior to use. To fill, hold the electrode by the sleeve and gently ease off the rubber wetting cap. Prepare as follows: 1.
1.
Invert the electrode. Hold the electrode just below the sleeve and with careful rotation and pulling along the axis of the electrode, remove the sleeve. DO NOT BEND.
2.
2.
Fill the annular space with electrolyte to approximately half to three quarter full. 1M potassium nitrate is normally recommended.
3.
3.
Slide the sleeve back onto the electrode ensuring the black O-ring is well seated within the electrode body. Do not exert sideways force. Any excess electrolyte will be expelled from the end of the electrode through the ground junction. Ensure there are no air bubbles in the sleeve.Wash off any excess electrolyte before use.
Max. ratio of Interfering Ions/ Bromide Ion as follows Chloride: 1 x 106, Bromide: 1 x 103, Cyanide: 2 x 10-2 Sulphide: Must be absent.
Cleaning If the membrane is poisoned by interferences, the surface may be renewed by careful polishing with fine wet-and-dry (P1200 grade). The electrode surface should appear yellow or yellow-grey with waxy lustre. Always inspect the membrane before use, and clean if necessary. Organic contaminants can be removed with ethanol. DO NOT use the electrode in chlorinated hydrocarbons.Routinely remove the sleeve and replace the potassium nitrate electrolyte.
Calibration Procedure With your meter set on mV (or on concentration on Ion Meters), calibrate by immersing the electrode in a stirred calibration standard (with added ISA), starting with the lowest concentration first. Wait for stability, note the potential in mV, and then carefully rinse and blot dry the electrode before repeating with the next highest standard, until all the calibration standards have been measured. When using meters that do not have direct concentration readouts, record the data and graph the potential against log of the Bromide Ion concentration. The graph should have a slope of approximately -55mV/decade of concentration at 25C.
Typical Calibration Curve
Electrolyte Replacement The electrode has an inbuilt double junction Ag/AgCl with a replaceable sleeve electrolyte. 1M potassium nitrate is suitable for most applications. Please consult Ionode Customer Service if you wish to use a different sleeve electrolyte.
Calibration Standards Standard solutions of Iodide Ion should preferably bracket the expected measurement range. For example, to determine Iodide ions in the 1-40mg/L range, it is usually adequate to use standard Iodide solutions in the following values:1.0, 10.0 and 100.0 mg/L
The need for ISA (Ionic Strength Adjuster) It is important to use ISA, so that the Ionic Strength of standards and samples is independent of the concentration of the Iodide Ion. A suitable ISA is potassium nitrate, which is added to both standards and samples. As a guide, add 5ml 1M potassium nitrate to every 25ml of calibration standard or sample.
Sample Measurement Follow the same basic procedures as calibration, substituting the calibration standard for your sample. It is important to use the same stirring conditions, temperature, etc for best results. Use the same ratio of sample/ISA as used in the calibration step. Read off the concentration from the graph or directly from Ion meters. For more information, visit ionode.com
